libucl: vendor import snapshort 20210314

Import libucl 0.8.0

Update libucl to git version 8d3b186

Update libucl to latest version

While here correctly link libucl to libm and register the dependency on libm
for static building

merge libucl 20140514

this version brings xpath-like interface for ucl objects

Import libucl 0.4.0
Adapt pkg(7) to the new libucl API

Import libucl into head

UCL is heavily infused by nginx configuration as the example of a convenient
configuration system. However, UCL is fully compatible with JSON format and is
able to parse json

Import libucl into head

UCL is heavily infused by nginx configuration as the example of a convenient
configuration system. However, UCL is fully compatible with JSON format and is
able to parse json files.

UCL is used by pkg(8) for its configuration file as well for the manifest format
in packages, it will be used in base for the pkg boostrap (signature checking
and configuration file parsing.)

libucl has been developped and is maintained by vsevolod@

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